ON THE MOTIONS AND SOUNDS OF THE HEART. 183 
the auricular systole, and the latter on the diastole of the 
auricles, both in the inferior and superior cava; no other 
motion was noted in the veins. 
8.7. The diastole of the auricles was a gradual swelling 
and enlargement of the visible parts of the cavities in all 
directions, requiring for its completion as much time as several 
systoles would do; and followed, on the instant of the full 
distension of the appendices, by systole of the whole heart,— 
first in the auricle, and then instantly in the ventricles: during 
its diastole, the auricle seemed to the eye to emerge, as it 
were, from the sinus venosus, and to swell out from a state of 
collapse, such as suction inwards toward the ventricle might 
cause, if any such force as suction existed in the heart. 
S. 8. In this, as in every observation, abnormal murmurs 
were observed at various moments, viz. immediately on the in- 
jection of the woorara, and at other times, but especially when 
pressure was made, whether intentionally or otherwise, over 
the orifices, exterior and interior, of the heart. ‘Toward the 
close of the observation, a loud musical sound was detected in 
the pulmonary artery with the diastole. At various times, for 
short spaces, the second sound of the heart was indistinct or 
absent, or masked by murmurs, without obvious cause in most 
instances, other than abnormal modes of action from irri- 
tation, hemorrhage, &c., exclusively of known structural 
changes. The first sound of the heart was often modified in 
various ways, and attended by murmurs, but never was want- 
ing so long as the heart acted with any energy. Toward the 
close, however, when the ventricular systole had become slow 
and gradual from quick and abrupt, the first sound was either 
very feeble, or not distinguishable at all. 
S. 9. The pulmonary artery was cut open; after which the 
first sound was still heard, but rather obtuse. A finger was 
then passed into the right ventricle, and the septum was felt 
to project convexly into the cavity, and in each systolic effort 
to press against the finger. 
Note.—Post mortem. One valve of the pulmonary orifice 
was found slightly injured by a puncture made in the course 
of experiments, in which the parietes cordis had been irritated 
to abnormal action by means of a needle. Wherever the needle 
penetrated into a cavity of the heart, there a clot was found, 
or at least a coloured plug of lymph in the internal opening. 
Post mortem. The ventricles were found to be of the same 
dimensions on careful examination. 
